@main.route('/')
def index():
    today = dt.datetime.today()
    greeting = "您好！现在是" + str(today.year) + "年" + str(today.month) + "月" + str(today.day) + "日，" + str(
        today.hour) + "时" + str(
        today.minute) + "分"
    return render_template('index.html', greeting=greeting)